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0. 12:21 AM - November List Fund Raiser (Matt Dralle)
1. 07:09 AM - Barrett M14P/PF Overhaul Specifications and Mods (Rhonda Bewley)
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| Subject: | November List Fund Raiser |
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| Subject: | Barrett M14P/PF Overhaul Specifications and Mods |
Listers:
I have recently received some requests for information regarding our
M14P modifications. We have been in development of our M14P overhaul
process for the last several years. It has been quite an interesting
project, and we have been delivering engines for the last 2 years. Our
concept was to develop a very high standard of overhaul, such as we
offer for horizontally opposed engines. We currently offer complete
overhaul capability and prop strike inspections. To my knowledge, we
have the only test cell in North America that can operate the engine to
full power and measure its power output and fuel consumption. Measured
thrust tests with our M14-P engines indicate that a -P engine, modified
as described below, produces more thrust that the -PF model and does it
on less fuel. The highest time modified M14-P engine we have in service
has 400 hours and is used in airshows.
The major modifications to the engine include the following:
* Newly designed, three ring, forged piston available in both
standard and slightly higher compression. We have had this piston/ring
package for two years, and Motorstar's ring package appears remarkably
similar. The alloy used in our forging has a lower thermal coefficient
of expansion and therefore can be operated at reduced clearances which
increases piston ring service life, reduces blow by and oil consumption.
Customers have reported a reduction in oil consumption from over a
quart/hour down to a quart in 8-10 hours, with the oil staying clean
through the whole oil change interval. We are not currently offering
high compression options for PF owners, because we want to be able to
obtain test data in our newly constructed test cell.
* Single port fuel injection through Airflow Performance. We have
dialed this system in and are getting good results with it. There are
some airframe mods which are the responsibility of the owner/operator
but they are easily accomplished, and we can provide some technical
support.
* A special micro-finish of the nose case gears to aide in keeping
oil temps down, especially important as we start to raise compression in
the engine. This process is extremely effective and has been taken from
NASCAR, as those folks have tremendous gearbox oil temperature issues.
We have also developed repair procedures to return impossible to get
parts to serviceable status. These include master rod bearings, nose
case sleeve, link rod pins, and a nickel-sil reconditioning of cylinder
barrels which are worn to maximum limits. The nickel-sil barrels are
currently being tested. Additionally, there are a number of parts which
we are seeking to manufacture which are difficult/impossible to obtain
via standard resources.
One of the exciting projects on the horizon is electronic ignition. We
currently have three prototypes built and are preparing for testing in
our test cell. We had hoped that the system would be available by late
fall, but it appears that we are probably one year away from delivery.
I do not have any anticipated costs for the new system at this time.
If you would like any additional information regarding this program,
please feel free to direct questions to Monty (monty@bpaengines.com),
Allen (bpa@bpaengines.com) or myself (Rhonda@bpaengines.com).
Rhonda Barrett-Bewley
Barrett Precision Engines, Inc.
Tulsa, OK
(918) 835-1089 phone
(918) 835-1754 fax
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